CN111306015A - Solar energy-geothermal energy mixed heat source combined cooling heating and power system and working method thereof - Google Patents
Solar energy-geothermal energy mixed heat source combined cooling heating and power system and working method thereof Download PDFInfo
- Publication number
- CN111306015A CN111306015A CN202010113194.1A CN202010113194A CN111306015A CN 111306015 A CN111306015 A CN 111306015A CN 202010113194 A CN202010113194 A CN 202010113194A CN 111306015 A CN111306015 A CN 111306015A
- Authority
- CN
- China
- Prior art keywords
- heat
- ammonia
- energy
- geothermal
- enters
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Granted
Links
Images
Classifications
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F03—MACHINES OR ENGINES FOR LIQUIDS; WIND, SPRING, OR WEIGHT MOTORS; PRODUCING MECHANICAL POWER OR A REACTIVE PROPULSIVE THRUST, NOT OTHERWISE PROVIDED FOR
- F03G—SPRING, WEIGHT, INERTIA OR LIKE MOTORS; MECHANICAL-POWER PRODUCING DEVICES OR MECHANISMS, NOT OTHERWISE PROVIDED FOR OR USING ENERGY SOURCES NOT OTHERWISE PROVIDED FOR
- F03G7/00—Mechanical-power-producing mechanisms, not otherwise provided for or using energy sources not otherwise provided for
- F03G7/04—Mechanical-power-producing mechanisms, not otherwise provided for or using energy sources not otherwise provided for using pressure differences or thermal differences occurring in nature
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F03—MACHINES OR ENGINES FOR LIQUIDS; WIND, SPRING, OR WEIGHT MOTORS; PRODUCING MECHANICAL POWER OR A REACTIVE PROPULSIVE THRUST, NOT OTHERWISE PROVIDED FOR
- F03G—SPRING, WEIGHT, INERTIA OR LIKE MOTORS; MECHANICAL-POWER PRODUCING DEVICES OR MECHANISMS, NOT OTHERWISE PROVIDED FOR OR USING ENERGY SOURCES NOT OTHERWISE PROVIDED FOR
- F03G6/00—Devices for producing mechanical power from solar energy
- F03G6/06—Devices for producing mechanical power from solar energy with solar energy concentrating means
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F24—HEATING; RANGES; VENTILATING
- F24S—SOLAR HEAT COLLECTORS; SOLAR HEAT SYSTEMS
- F24S20/00—Solar heat collectors specially adapted for particular uses or environments
- F24S20/40—Solar heat collectors combined with other heat sources, e.g. using electrical heating or heat from ambient air
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F24—HEATING; RANGES; VENTILATING
- F24T—GEOTHERMAL COLLECTORS; GEOTHERMAL SYSTEMS
- F24T10/00—Geothermal collectors
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
- F25B—REFRIGERATION MACHINES, PLANTS OR SYSTEMS; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS
- F25B29/00—Combined heating and refrigeration systems, e.g. operating alternately or simultaneously
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E10/00—Energy generation through renewable energy sources
- Y02E10/10—Geothermal energy
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E10/00—Energy generation through renewable energy sources
- Y02E10/40—Solar thermal energy, e.g. solar towers
- Y02E10/46—Conversion of thermal power into mechanical power, e.g. Rankine, Stirling or solar thermal engines
Landscapes
- Engineering & Computer Science (AREA)
- Chemical & Material Sciences (AREA)
- Combustion & Propulsion (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Life Sciences & Earth Sciences (AREA)
- Sustainable Development (AREA)
- Sustainable Energy (AREA)
- Physics & Mathematics (AREA)
- Thermal Sciences (AREA)
- Engine Equipment That Uses Special Cycles (AREA)
Abstract
The invention discloses a solar energy-geothermal energy mixed heat source combined cooling heating power system and a working method thereof, and belongs to the technical field of renewable energy development and utilization and power engineering. The system comprises a solar heat collection unit, a geothermal energy circulating unit, a Kalina power generation circulation-ammonia water absorption type refrigeration circulating unit, a hot user loop and a cold user loop. Ammonia water is used as a circulating working medium, Kalina power generation circulation and ammonia absorption refrigeration circulation are organically integrated to form a novel solar energy-geothermal energy mixed heat source combined cooling heating and power system, and solar energy and geothermal energy are fully utilized to provide electric energy, cold energy and heat energy for users at the same time. By recycling waste heat of Kalina power generation circulation and ammonia absorption refrigeration circulation, the supply of heat energy is increased on the basis of generating electric energy and cold energy, the cascade utilization of energy is realized, the energy conversion efficiency of the system is effectively improved, and the system is green, environment-friendly and wide in application range.
Description
Technical Field
The invention belongs to the technical field of renewable energy development and utilization and power engineering, and particularly relates to a solar energy-geothermal energy mixed heat source combined cooling heating and power system and a working method thereof.
Background
With the increasing demand of human beings for energy, the burning of fossil energy on a large scale has caused serious influences on the atmospheric environment and the ecological environment, and people are more and more worried about the problems of resource exhaustion and environmental pollution caused by the large use of traditional fossil energy. Under such circumstances, renewable clean new energy sources such as solar energy and geothermal energy are receiving increasing attention from countries around the world. In 2006, 1 month, China promulgates a renewable energy law of the people's republic of China, and scientific and technical research and industrial development of renewable energy development and utilization are prioritized fields of scientific and technological development and high-tech industrial development. The development and utilization of solar energy and geothermal energy resources play a vital role in saving fossil energy, protecting the ecological environment and reducing the emission of carbon dioxide. At present, the comprehensive utilization of solar energy and geothermal energy in China mainly focuses on the aspects of power generation and heating.
During the past decades, researchers have made many attempts to combine two types of energy in a solar-geothermal combined power system, and there are four types in general, as shown in fig. 1: as shown in figure 1a, geothermal water is pumped out from the ground, firstly absorbs heat through a solar heat collector to raise the temperature, and then enters a flash evaporator to carry out decompression flash evaporation. The generated steam enters a steam turbine to do work to drive a generator to generate electricity, and the exhausted steam of the steam turbine is cooled by a condenser and then is recharged to the underground or used for other purposes. And (5) recharging the geothermal water remained in the flash evaporator to the ground. As shown in FIG. 1b, geothermal water is pumped out from the ground and directly enters a flash evaporator for decompression and flash evaporation. The generated steam enters the solar heat collector to absorb heat to be in an overheated state, then enters the steam turbine to do work to drive the generator to generate electricity, and the exhausted steam of the steam turbine is cooled by the condenser and then is recharged to the underground or used for other purposes. And (5) recharging the geothermal water remained in the flash evaporator to the ground. As shown in figure 1c, geothermal water is pumped out from the ground and enters a first-stage flash evaporator for decompression and flash evaporation, and the generated steam enters a steam turbine for acting to drive a generator to generate power. The residual geothermal water in the primary flash evaporator enters a solar heat collector to absorb heat and raise temperature, then enters a secondary flash evaporator to continuously reduce pressure and flash, and the generated steam serving as complementary steam enters a steam turbine to do work to drive a generator to generate power. The exhausted steam of the steam turbine is cooled by the condenser and then is recharged to the ground or used for other purposes. And (4) recharging the geothermal water remained in the secondary flash evaporator underground. As shown in fig. 1d, geothermal energy and solar energy are used as a low temperature heat source and a high temperature heat source of the organic rankine cycle, respectively. The organic working medium continuously passes through the heat exchanger 1 and the heat exchanger 2 to be preheated, evaporated and overheated, and then enters the organic turbine to expand to do work to drive the generator to generate electricity. After the turbine exhaust is cooled to be liquid through the condenser, the turbine exhaust is boosted through the booster pump and finally returns to the evaporator again, and a cycle is completed.
The ground source heat pump is a heating and air conditioning system which utilizes the shallow geothermal resources on the earth surface as a heat source to convert energy. The building heat load in cold areas is large, the ground source heat pump runs for a long time, the temperature of underground soil is easy to be unbalanced, the efficiency of the whole ground source heat pump system is greatly influenced, and meanwhile, the underground ecological balance can be damaged. After solar energy is added, when the ground source heat pump operates in a heating season, the fluctuation of the soil temperature is relatively reduced, so that the heat pump unit has higher efficiency. The solar ground source heat pump system generally has two operation modes of series connection and parallel connection, as shown in fig. 2. In the series operation mode shown in fig. 2a, the plate heat exchanger (connected with the solar heat storage water tank) and the ground heat exchanger are operated in series, and the heat-carrying fluid firstly passes through the ground heat exchanger, then passes through the plate heat exchanger, and then enters the heat pump unit to work. When the temperature in the water tank is low at night or in cloudy days, the soil source heat pump is independently adopted for heating. In the parallel operation mode shown in fig. 2b, the plate heat exchanger and the buried pipe heat exchanger operate in parallel, and heat-carrying fluid enters the plate heat exchanger and the buried pipe heat exchanger simultaneously to absorb heat and then enters the heat pump unit to work.
However, the solar energy-geothermal energy mixed heat source is single in utilization form and low in utilization rate, and cannot meet the various requirements of users on cold, heat, electricity and the like in the current production and life.
Disclosure of Invention
In order to solve the defects in the prior art, the invention aims to provide a solar energy-geothermal energy mixed heat source combined cooling heating and power system and a working method thereof, which realize the cascade utilization of energy, have high utilization rate, can simultaneously supply power, heat and cold, are green and environment-friendly and have wide application range.
The invention is realized by the following technical scheme:
the invention discloses a solar energy-geothermal energy mixed heat source cooling, heating and power combined supply system, which comprises a solar energy heat collecting unit, a geothermal energy circulating unit, a Kalina power generation circulation-ammonia water absorption type refrigeration circulating unit, a heat user loop and a cold user loop;
the solar heat collection unit comprises a solar heat collector array and a heat storage device, and the solar heat collector array and the heat storage device are connected through a heat conducting medium loop;
the geothermal energy circulating unit comprises a geothermal water loop and a first booster pump arranged on the geothermal water loop, and the geothermal water loop is connected with a geothermal well;
the Kalina power generation circulation-ammonia absorption refrigeration circulation unit comprises an ammonia water separator, a turbine, a rectifying tower, a first condenser, an absorber, an evaporator, a second heat exchanger and a second condenser; an ammonia-rich vapor outlet of the ammonia water separator is connected with a turbine, the turbine is connected with a generator, an ammonia-poor solution outlet of the ammonia water separator is connected with a heat source inlet of the rectifying tower, and heat source outlets of the turbine and the rectifying tower are connected with a second heat exchanger; the second heat exchanger is connected with a second condenser, the second condenser is connected with an inlet of the ammonia water separator, and a third booster pump is arranged between the second condenser and the inlet of the ammonia water separator; the vapor outlet of the rectifying tower is connected with a first condenser, the first condenser is connected with an evaporator, the evaporator is connected with the gas phase inlet of an absorber, and the liquid phase inlet of the absorber is connected with the dilute ammonia solution outlet of the rectifying tower; an outlet of the absorber is connected with a concentrated ammonia solution inlet of the rectifying tower, and a second booster pump is arranged between the outlet of the absorber and the concentrated ammonia solution inlet of the rectifying tower;
the heat user loop flows through the first condenser, the absorber and the second heat exchanger and then is connected with a heat user;
the cold user loop flows through the evaporator and then is connected with a cold user;
a first heat exchanger is arranged between the solar heat collection unit and the geothermal energy circulating unit, a steam generator is arranged between the geothermal energy circulating unit and the Kalina power generation circulation-ammonia water absorption type refrigeration circulating unit, and a superheater is arranged between the solar heat collection unit and the Kalina power generation circulation-ammonia water absorption type refrigeration circulating unit.
Preferably, the heat storage device comprises a heat storage tank, and the heat storage tank is connected with a hot tank and a cold tank.
Preferably, the solar heat collecting unit further comprises an auxiliary heating boiler, and the auxiliary heating boiler is arranged on the heat conducting medium loop.
Preferably, a first throttle valve is arranged between the heat source outlet of the rectifying tower and the second heat exchanger.
Preferably, a second throttle valve is arranged between the liquid-phase inlet of the absorber and the dilute ammonia solution outlet of the rectifying tower.
Preferably, a third throttle valve is provided between the first condenser and the evaporator.
The invention discloses a working method of the solar energy-geothermal energy mixed heat source combined cooling heating and power system, which comprises the following steps:
the heat-conducting medium circulates in the heat-conducting medium loop, after the heat-conducting medium is heated in the solar heat collector array, one part of heat carried by the heat-conducting medium is stored by the heat storage device, and the other part of heat carried by the heat-conducting medium is used for heating ammonia-rich steam in the superheater and heating geothermal water in the first heat exchanger;
geothermal water circulates in a geothermal water loop, is pumped out of a geothermal well, is pressurized by a first booster pump, enters a first heat exchanger to absorb heat and raise the temperature, then enters a steam generator to heat basic ammonia solution, and is refilled into the geothermal well;
the ammonia water basic solution absorbs heat in a steam generator and evaporates to a two-phase state, then enters an ammonia water separator to separate saturated ammonia-rich steam and saturated ammonia-poor solution, the ammonia-rich steam enters a superheater to continuously absorb heat to a superheated state, then enters a turbine to expand and do work to drive a generator to generate power, the ammonia-poor solution enters a rectifying tower to be used as a heat source to release heat, is subjected to pressure reduction and then is mixed with turbine exhaust steam to regenerate the ammonia water basic solution, the ammonia water basic solution enters a second heat exchanger to release residual heat, then enters a second condenser to be cooled to a liquid state, and then is subjected to pressure boosting by a third booster pump and then is sent back to the steam generator again to absorb heat;
after the concentrated ammonia solution enters a rectifying tower and is evaporated, stripped and rectified, ammonia vapor enters a first condenser through a vapor outlet of the rectifying tower, the rest dilute ammonia solution enters an absorber from a dilute ammonia solution outlet of the rectifying tower, the ammonia vapor is cooled to be liquid ammonia in the first condenser, low-temperature two-phase ammonia fluid is generated after pressure reduction and temperature reduction and then enters an evaporator for evaporation and heat absorption, refrigerant water is cooled, and the two-phase ammonia fluid after heat absorption is completely changed into saturated ammonia vapor and then enters the absorber; after the pressure of the dilute ammonia solution is reduced, the dilute ammonia solution enters an absorber to absorb saturated ammonia vapor, releases heat at the same time, regenerates a concentrated ammonia solution, and enters a rectifying tower again after being boosted by a second booster pump;
water in the heat user loop absorbs heat in the first condenser, the absorber and the second heat exchanger in sequence and then is supplied to a heat user;
the water in the cold user circuit is cooled in the evaporator and then supplied to the cold user.
Compared with the prior art, the invention has the following beneficial technical effects:
the invention discloses a solar energy-geothermal energy mixed heat source cooling, heating and power combined supply system which comprises a solar energy heat collection unit, a geothermal energy circulating unit, a Kalina power generation circulation-ammonia water absorption type refrigeration circulating unit, a heat user loop and a cold user loop. The Kalina power generation cycle and the ammonia absorption refrigeration cycle are organically integrated to form a novel solar energy-geothermal energy mixed heat source combined cooling heating and power system, and solar energy and geothermal energy are fully utilized to provide electric energy, cold energy and heat energy for users at the same time. The ammonia water mixture is used as a circulating working medium, belongs to a non-azeotropic mixture and has the characteristic of temperature slippage in a two-phase region, so that the ammonia water and other fluids can achieve better temperature matching in the heat exchange process, the irreversible loss in the heat exchange process is effectively reduced, and the efficiency of the whole system is improved. And the ammonia water mixture also has the advantages of large specific enthalpy drop, low price and the like, reduces the design size of impeller mechanical equipment, and effectively improves the economical efficiency of parts and systems. By recycling waste heat of Kalina power generation circulation and ammonia absorption refrigeration circulation, the supply of heat energy is increased on the basis of generating electric energy and cold energy, the cascade utilization of energy is realized, the energy conversion efficiency of the system is effectively improved, and the system is green, environment-friendly and wide in application range.
Further, when the temperature of the heat conduction oil entering the system can not meet the requirement, the heat supplementing boiler can heat the heat conduction oil so as to ensure the normal operation of the system.
The invention discloses a working method of the solar energy-geothermal energy mixed heat source combined cooling heating and power system, which is used for carrying out combined cooling heating and power by mixing and utilizing solar energy and geothermal energy, can simultaneously meet the requirements of users on different types of energy, accords with the cascade utilization principle of energy, improves the energy utilization efficiency of the solar energy and geothermal energy, and has important scientific significance and application value for realizing energy conservation and emission reduction and developing low-carbon economy.
Drawings
FIGS. 1a, 1b, 1c and 1d are schematic diagrams of four versions of a prior art solar-geothermal combined power generation system, respectively;
fig. 2a is a schematic diagram of a series operation mode of a solar ground source heat pump system;
fig. 2b is a schematic diagram of a parallel operation mode of the solar ground source heat pump system; .
Fig. 3 is a schematic diagram of the overall structure of the combined cooling, heating and power system of the solar energy-geothermal energy mixed heat source of the invention.
In the figure: 1-solar heat collector array, 2-heat storage tank, 3-heat tank, 4-cold tank, 5-afterburning boiler, 6-first booster pump, 7-first heat exchanger, 8-steam generator, 9-ammonia water separator, 10-superheater, 11-turbine, 12-generator, 13-rectifying tower, 14-first condenser, 15-first throttle valve, 16-second throttle valve, 17-second booster pump, 18-absorber, 19-third throttle valve, 20-evaporator, 21-second heat exchanger, 22-second condenser and 23-third booster pump.
Detailed Description
The invention will now be described in further detail with reference to the following drawings and specific examples, which are intended to be illustrative and not limiting:
fig. 3 is a combined cooling, heating and power system of a solar energy-geothermal energy mixed heat source of the present invention, which includes a solar heat collection unit, a geothermal energy circulation unit, a Kalina power generation circulation-ammonia absorption refrigeration circulation unit, a heat consumer circuit and a cold consumer circuit;
the solar heat collection unit comprises a solar heat collector array 1 and a heat storage device, the solar heat collector array 1 and the heat storage device are connected through a heat conducting medium loop, preferably, the heat storage device comprises a heat storage tank 2, the heat storage tank 2 is connected with a heat storage tank 3 and a cold storage tank 4, and surplus heat energy can be stored for use at night or in the case of insufficient sunlight; preferably, a supplementary heating boiler 5 may be provided in the solar heat collecting unit.
The geothermal energy circulating unit comprises a geothermal water loop and a first booster pump 6 arranged on the geothermal water loop, and the geothermal water loop is connected with a geothermal well;
the Kalina power generation cycle-ammonia absorption refrigeration cycle unit comprises an ammonia water separator 9, a turbine 11, a rectifying tower 13, a first condenser 14, an absorber 18, an evaporator 20, a second heat exchanger 21 and a second condenser 22; an ammonia-rich vapor outlet of the ammonia water separator 9 is connected with a turbine 11, the turbine 11 is connected with a generator 12, an ammonia-poor solution outlet of the ammonia water separator 9 is connected with a heat source inlet of a rectifying tower 13, heat source outlets of the turbine 11 and the rectifying tower 13 are connected with a second heat exchanger 21, and a first throttle valve 15 is arranged between the heat source outlet of the rectifying tower 13 and the second heat exchanger 21.
The second heat exchanger 21 is connected with a second condenser 22, the second condenser 22 is connected with an inlet of the ammonia water separator 9, and a third booster pump 23 is arranged between the second condenser 22 and the inlet of the ammonia water separator 9; a vapor outlet of the rectifying tower 13 is connected with a first condenser 14, the first condenser 14 is connected with an evaporator 20, a third throttle valve 19 is arranged between the first condenser 14 and the evaporator 20, the evaporator 20 is connected with a gas-phase inlet of an absorber 18, a liquid-phase inlet of the absorber 18 is connected with a dilute ammonia solution outlet of the rectifying tower 13, and a second throttle valve 16 is arranged between the liquid-phase inlet of the absorber 18 and the dilute ammonia solution outlet of the rectifying tower 13; an outlet of the absorber 18 is connected with a concentrated ammonia solution inlet of the rectifying tower 13, and a second booster pump 17 is arranged between the outlet of the absorber 18 and the concentrated ammonia solution inlet of the rectifying tower 13;
the hot user loop is connected with a hot user after flowing through the first condenser 14, the absorber 18 and the second heat exchanger 21; the cold user loop is connected to the cold user after passing through the evaporator 20;
a first heat exchanger 7 is arranged between the solar heat collection unit and the geothermal energy circulating unit, a steam generator 8 is arranged between the geothermal energy circulating unit and the Kalina power generation circulation-ammonia water absorption type refrigeration circulating unit, and a superheater 10 is arranged between the solar heat collection unit and the Kalina power generation circulation-ammonia water absorption type refrigeration circulating unit.
The principle and the working method of the solar energy-geothermal energy mixed heat source combined cooling heating and power system are as follows:
as shown in fig. 3, the system can be divided into six circuits according to the difference of the flowing working medium in the pipeline, including a conduction oil circuit (solid line), a geothermal water circuit (single-dot chain line), a Kalina circulating ammonia water circuit (long dotted line), an absorption circulating ammonia water circuit (middle long dotted line), a domestic hot water circuit (double-dot chain line) and a refrigerant water circuit (short dotted line). It should be noted that the household hot water circuit and the refrigerant water circuit are open circuits in the drawing, because the part of the rear half circuit connected with the user is omitted from the drawing and is not shown.
In the heat conduction oil loop, firstly, heat conduction oil is heated to a higher temperature in the solar heat collector array 1, then the heat conduction oil is divided into two strands, one strand is sent to a thermodynamic system, ammonia-rich steam and geothermal water are respectively heated in the superheater 10 and the first heat exchanger 7 in sequence, and finally the two strands return to the solar heat collector array 1; the other one is sent to a heat storage device (comprising a heat storage tank 2, a hot tank 3 and a cold tank 4) to store surplus heat energy for use at night or in the case of insufficient sunlight. In addition, a post-combustion boiler 5 is arranged for heating the heat-conducting oil when the temperature of the heat-conducting oil entering the thermodynamic system cannot meet the requirement, so that the normal operation of the thermodynamic system is ensured.
In the geothermal water loop, firstly geothermal water is pumped out of a geothermal well, the pressure of the geothermal water is increased by a first booster pump 6, then the geothermal water enters a first heat exchanger 7 to absorb heat and raise the temperature, then the geothermal water enters a steam generator 8 to heat the ammonia water basic solution, and finally the geothermal water is refilled into the geothermal well.
In the Kalina circulating ammonia water circuit, the basic ammonia water solution is evaporated to a two-phase state in a steam generator 8 through heat absorption, and then enters an ammonia water separator 9 to separate saturated ammonia-rich steam and saturated ammonia-poor solution. The ammonia-rich steam enters the superheater 10 to continuously absorb heat to a superheated state, and then enters the turbine 11 to expand and do work to drive the generator 12 which is coaxially connected to generate electric energy. The lean ammonia solution is sent to the rectifying tower 13 to be used as a heat source for the rectifying process to release heat, and then is subjected to pressure reduction through the first throttling valve 15 and mixed with turbine exhaust steam to regenerate the basic ammonia water solution. The fluid enters the second heat exchanger 21 to release residual heat, then enters the second condenser 22 to be condensed into liquid by cooling water, and then is sent back to the steam generator 8 to absorb heat after being boosted by the third booster pump 23.
In the absorption type circulating ammonia water loop, a strand of concentrated ammonia solution is sent into the rectifying tower 13, through a series of evaporation, stripping and rectifying processes, ammonia vapor is produced at an outlet at the upper end of the rectifying tower 13, and the rest dilute ammonia solution is discharged from an outlet at the lower end of the rectifying tower 13. The ammonia vapor is first cooled to liquid ammonia in the first condenser 14 and then depressurized and cooled by the third throttle valve 19 to produce a low temperature two-phase ammonia fluid. The ammonia fluid enters an evaporator 20 to evaporate and absorb heat, the refrigerant water is cooled to about 5 ℃, the whole phase of the two-phase ammonia fluid after heat absorption is changed into saturated ammonia vapor, and then the saturated ammonia vapor is conveyed into an absorber 18. The dilute ammonia solution discharged from the rectifying tower 13 is depressurized by the second throttle valve 16, and then enters the absorber 18 to absorb the saturated ammonia vapor, and simultaneously release heat to regenerate the concentrated ammonia solution. After the pressure of the concentrated ammonia solution is increased by the second booster pump 17, the concentrated ammonia solution is sent back to the rectifying tower 13 again for the rectifying process.
For the domestic hot water loop, firstly, water at the ambient temperature is used as cooling water and enters the first condenser 14 to absorb heat released in the condensation process of ammonia vapor, then enters the absorber 18 to absorb heat released in the process of absorbing saturated ammonia vapor by dilute ammonia solution, and finally enters the second heat exchanger 21 to absorb residual heat of basic solution of ammonia water, and finally the temperature reaches about 70 ℃, and the residual heat is sent to a user to be used as domestic hot water.
For the chilled water loop, water at ambient temperature enters the evaporator 20, is directly cooled to about 5 ℃ by the low-temperature two-phase ammonia fluid, and then is sent to a user as chilled water for central air conditioning or other uses.
It should be noted that the above description is only a part of the embodiments of the present invention, and equivalent changes made to the system described in the present invention are included in the protection scope of the present invention. Persons skilled in the art to which this invention pertains may substitute similar alternatives for the specific embodiments described, all without departing from the scope of the invention as defined by the claims.
Claims (7)
1. A combined cooling, heating and power system with a solar energy-geothermal energy mixed heat source is characterized by comprising a solar energy heat collection unit, a geothermal energy circulating unit, a Kalina power generation circulation-ammonia water absorption refrigeration circulating unit, a heat user loop and a cold user loop;
the solar heat collection unit comprises a solar heat collector array (1) and a heat storage device, wherein the solar heat collector array (1) is connected with the heat storage device through a heat-conducting medium loop;
the geothermal energy circulating unit comprises a geothermal water loop and a first booster pump (6) arranged on the geothermal water loop, and the geothermal water loop is connected with a geothermal well;
the Kalina power generation circulation-ammonia absorption refrigeration cycle unit comprises an ammonia water separator (9), a turbine (11), a rectifying tower (13), a first condenser (14), an absorber (18), an evaporator (20), a second heat exchanger (21) and a second condenser (22); an ammonia-rich vapor outlet of the ammonia water separator (9) is connected with a turbine (11), the turbine (11) is connected with a generator (12), an ammonia-poor solution outlet of the ammonia water separator (9) is connected with a heat source inlet of a rectifying tower (13), and heat source outlets of the turbine (11) and the rectifying tower (13) are connected with a second heat exchanger (21); the second heat exchanger (21) is connected with a second condenser (22), the second condenser (22) is connected with an inlet of the ammonia water separator (9), and a third booster pump (23) is arranged between the second condenser (22) and the inlet of the ammonia water separator (9); a vapor outlet of the rectifying tower (13) is connected with a first condenser (14), the first condenser (14) is connected with an evaporator (20), the evaporator (20) is connected with a gas phase inlet of an absorber (18), and a liquid phase inlet of the absorber (18) is connected with a dilute ammonia solution outlet of the rectifying tower (13); an outlet of the absorber (18) is connected with a concentrated ammonia solution inlet of the rectifying tower (13), and a second booster pump (17) is arranged between the outlet of the absorber (18) and the concentrated ammonia solution inlet of the rectifying tower (13);
the hot user loop flows through the first condenser (14), the absorber (18) and the second heat exchanger (21) and then is connected with a hot user;
the cold user loop is connected with a cold user after flowing through the evaporator (20);
a first heat exchanger (7) is arranged between the solar heat collection unit and the geothermal energy circulating unit, a steam generator (8) is arranged between the geothermal energy circulating unit and the Kalina power generation circulation-ammonia water absorption type refrigeration circulating unit, and a superheater (10) is arranged between the solar heat collection unit and the Kalina power generation circulation-ammonia water absorption type refrigeration circulating unit.
2. A combined cooling, heating and power system as claimed in claim 1, characterized in that the heat storage device comprises a heat storage tank (2), and the heat storage tank (2) is connected with a hot tank (3) and a cold tank (4).
3. A combined cooling, heating and power system as defined in claim 1, wherein the solar energy and geothermal energy hybrid heat source further comprises a supplementary heating boiler (5), the supplementary heating boiler (5) being disposed on the heat conducting medium loop.
4. The combined cooling, heating and power system as claimed in claim 1, characterized in that a first throttle (15) is provided between the outlet of the heat source of the rectifying tower (13) and the second heat exchanger (21).
5. The combined cooling, heating and power system as claimed in claim 1, characterized in that a second throttle valve (16) is provided between the liquid phase inlet of the absorber (18) and the dilute ammonia solution outlet of the rectifying tower (13).
6. A combined cooling, heating and power system according to claim 1, characterised in that a third throttle (19) is provided between the first condenser (14) and the evaporator (20).
7. The working method of the combined cooling heating and power system with the solar energy-geothermal energy mixed heat source according to any one of claims 1 to 6, comprising the following steps:
the heat-conducting medium circulates in the heat-conducting medium loop, after the heat-conducting medium is heated in the solar heat collector array (1), one part of heat carried by the heat-conducting medium is stored by the heat storage device, and the other part of heat carried by the heat-conducting medium is used for heating ammonia-rich vapor in the superheater (10) and heating geothermal water in the first heat exchanger (7);
geothermal water circulates in a geothermal water loop, is pumped out of a geothermal well, is pressurized by a first booster pump (6), enters a first heat exchanger (7) to absorb heat and raise the temperature, then enters a steam generator (8) to heat basic ammonia solution, and is refilled into the geothermal well;
the ammonia water basic solution absorbs heat in a steam generator (8) and evaporates to a two-phase state, then enters an ammonia water separator (9) to separate saturated ammonia-rich steam and saturated ammonia-poor solution, the ammonia-rich steam enters a superheater (10) to continuously absorb heat to a superheated state, then enters a turbine (11) to expand and do work, a generator (12) is driven to generate power, the ammonia-poor solution enters a rectifying tower (13) to be used as a heat source to release heat, is subjected to pressure reduction and then is mixed with turbine exhaust steam to regenerate the ammonia water basic solution, the ammonia water basic solution enters a second heat exchanger (21) to release residual heat, then enters a second condenser (22) to be cooled to a liquid state, is subjected to pressure boosting by a third booster pump (23), and is sent back to the steam generator (8) again to absorb heat;
after a concentrated ammonia solution enters a rectifying tower (13) and is evaporated, stripped and rectified, ammonia vapor enters a first condenser (14) through a vapor outlet of the rectifying tower (13), the rest dilute ammonia solution enters an absorber (18) from a dilute ammonia solution outlet of the rectifying tower (13), the ammonia vapor is cooled to be liquid ammonia in the first condenser (14), low-temperature two-phase ammonia fluid is generated after pressure reduction and temperature reduction and then enters an evaporator (20) to be evaporated and absorbed, refrigerant water is cooled, and the two-phase ammonia fluid after heat absorption is completely changed into saturated ammonia vapor and then enters the absorber (18); after the pressure of the dilute ammonia solution is reduced, the dilute ammonia solution enters an absorber (18) to absorb saturated ammonia vapor, simultaneously releases heat, regenerates concentrated ammonia solution, and enters a rectifying tower (13) again after the pressure of the concentrated ammonia solution is increased by a second booster pump (17);
the water in the heat user loop absorbs heat in the first condenser (14), the absorber (18) and the second heat exchanger (21) in sequence and then is supplied to a heat user;
the water in the cold user circuit is supplied to the cold user after being cooled in the evaporator (20).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010113194.1A CN111306015B (en) | 2020-02-24 | 2020-02-24 | Solar energy-geothermal energy mixed heat source combined cooling heating and power system and working method thereof |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010113194.1A CN111306015B (en) | 2020-02-24 | 2020-02-24 | Solar energy-geothermal energy mixed heat source combined cooling heating and power system and working method thereof |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN111306015A true CN111306015A (en) | 2020-06-19 |
| CN111306015B CN111306015B (en) | 2021-04-23 |
Family
ID=71156699
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202010113194.1A Active CN111306015B (en) | 2020-02-24 | 2020-02-24 | Solar energy-geothermal energy mixed heat source combined cooling heating and power system and working method thereof |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN111306015B (en) |
Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112413922A (en) * | 2020-11-18 | 2021-02-26 | 山东大学 | Power-cooling combined supply system and method for fully utilizing middle-low grade industrial waste heat |
| CN112833583A (en) * | 2021-01-21 | 2021-05-25 | 青岛科技大学 | Geothermal energy distributed energy supply system |
| CN112880230A (en) * | 2021-04-29 | 2021-06-01 | 湖南大学 | Power generation and refrigeration combined system |
| CN113932476A (en) * | 2021-11-18 | 2022-01-14 | 中国科学院理化技术研究所 | Absorption type cold and heat combined supply system and control method thereof |
| CN114109749A (en) * | 2021-11-12 | 2022-03-01 | 西安热工研究院有限公司 | Solar energy-geothermal energy organic Rankine cycle power generation system and use method |
| CN114623608A (en) * | 2022-03-18 | 2022-06-14 | 成都理工大学 | Concentrating photovoltaic thermal system for poly-generation |
-
2020
- 2020-02-24 CN CN202010113194.1A patent/CN111306015B/en active Active
Cited By (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112413922A (en) * | 2020-11-18 | 2021-02-26 | 山东大学 | Power-cooling combined supply system and method for fully utilizing middle-low grade industrial waste heat |
| CN112413922B (en) * | 2020-11-18 | 2022-06-21 | 山东大学 | Power-cooling combined supply system and method for fully utilizing middle-low grade industrial waste heat |
| CN112833583A (en) * | 2021-01-21 | 2021-05-25 | 青岛科技大学 | Geothermal energy distributed energy supply system |
| CN112880230A (en) * | 2021-04-29 | 2021-06-01 | 湖南大学 | Power generation and refrigeration combined system |
| CN112880230B (en) * | 2021-04-29 | 2021-07-02 | 湖南大学 | Power generation and refrigeration combined system |
| CN114109749A (en) * | 2021-11-12 | 2022-03-01 | 西安热工研究院有限公司 | Solar energy-geothermal energy organic Rankine cycle power generation system and use method |
| CN113932476A (en) * | 2021-11-18 | 2022-01-14 | 中国科学院理化技术研究所 | Absorption type cold and heat combined supply system and control method thereof |
| CN114623608A (en) * | 2022-03-18 | 2022-06-14 | 成都理工大学 | Concentrating photovoltaic thermal system for poly-generation |
| CN114623608B (en) * | 2022-03-18 | 2023-03-14 | 成都理工大学 | Concentrating photovoltaic thermal system for poly-generation |
Also Published As
| Publication number | Publication date |
|---|---|
| CN111306015B (en) | 2021-04-23 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN111306015B (en) | Solar energy-geothermal energy mixed heat source combined cooling heating and power system and working method thereof | |
| CN107630726B (en) | Multi-energy hybrid power generation system and method based on supercritical carbon dioxide circulation | |
| CN101871440A (en) | Solar energy-natural gas complementary injection type distributed combined cold heat and power supply device | |
| CN201062902Y (en) | Solar light concentrating photovoltaic combination system | |
| CN102563987A (en) | Vapor-compression refrigerating plant driven by organic Rankine cycle and method | |
| CN101196354A (en) | Injection type low-temperature waste-heat power generation refrigerating method | |
| CN101566406A (en) | Solar photovoltaic and photothermal cogeneration type hybrid heat pump | |
| CN112814860B (en) | Circulating complementary cogeneration system of tower type solar photo-thermal power generation refrigerator and operation method thereof | |
| CN112503782A (en) | Oil field waste heat recovery system and method applying solar energy and lithium bromide heat pump | |
| CN113775494A (en) | Ocean thermoelectric generation cold seawater cascade utilization system | |
| CN111271898B (en) | Combined cooling heating and power system based on geothermal energy and working method thereof | |
| CN111306835B (en) | Ammonia water working medium combined cooling heating and power system utilizing medium-low temperature heat source and working method thereof | |
| CN211116438U (en) | Power generation and refrigeration combined cycle system based on ocean temperature difference energy | |
| CN202501677U (en) | Steam compression refrigeration device driven by organic Rankine cycle | |
| CN115111806B (en) | Combined heat and power system and method based on energy cascade utilization | |
| CN215001823U (en) | Geothermal energy step heating system based on double-stage absorption heat pump | |
| CN112880230B (en) | Power generation and refrigeration combined system | |
| CN204646526U (en) | A kind of power and refrigeration cogeneration system | |
| CN210892819U (en) | Parallel connection type cooling, heating and power three-generation card array nano circulating system device | |
| CN210033553U (en) | ORC magnetic suspension power generation system for cascade utilization of medium-low temperature geothermal working medium | |
| CN208547140U (en) | Geothermal energy cogeneration cooling heating system | |
| TWI399512B (en) | A low-grade heat-utilizing device and approach for producing power and refrigeration | |
| CN218850652U (en) | Novel thermal-arrest thermoelectric energy conversion system | |
| CN101865097A (en) | Ejection-type distributed combined cooling heating and power (CCHP) supply method complemented by solar and gas | |
| CN213777866U (en) | Absorption type ground source heat pump and cogeneration unit coupling energy supply system |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PB01 | Publication | ||
| PB01 | Publication | ||
| SE01 | Entry into force of request for substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| GR01 | Patent grant | ||
| GR01 | Patent grant |